The Expanded and Diversified Calmodulin-Binding Protein 60 (CBP60) Family in Rice (Oryza sativa L.) Is Conserved in Defense Responses against Pathogens

Plant disease management is key to sustainable production of staple food crops. Calcium (Ca2+) signal and phytohormones play critical roles in regulating plant defense responses against pathogens. The Ca2+ signals are sensed, decoded transduced by calmodulin other -binding proteins, followed interaction with modulation activities target proteins such as calmodulin-binding (CBPs). Members the Arabidopsis CBP60 gene family, AtCBP60g AtSARD1, have emerged major regulators immune responses. In this study, we identified a 15 member family rice (Oryza sativa) which OsCBP60g-3, OsCBP60g-4, OsCBP60a OsSARD-like1 genes were consistently upregulated seedlings response infection both fungal (Magnaporthe oryzae) bacterial (Xanthomonas pathogens well salicylic acid (SA). OsCBP60g-4 OsCBP60g-3 induced maximally SA brassinosteroid (BR), respectively, was expressed at 3-fold higher levels M. oryzae resistant genotype (IC-346004) compared susceptible (Rajendra Kasturi). considerable expansion immunity clade up-regulation several OsCBP60 hormones supports importance further investigating targets for increasing resistance rice.